CloudStrife, I don't mean to pry into your relationship with the Saviour but you started out by saying you became a Christian 4-5 years ago but almost immediately abandoned that for something else. I think you are getting some good advice here, but it is coming from people who may very well know nothing of the mental illness that is Obsessive-Compulsive Disorder, and the extent OCD may torment you with doubts, anxiety, irrational behavior, and so many other things completely beyond your ability to deal with.
This would be my recommendation to you. Get or continue therapy and make sure to take whatever meds you have been given. Ask your therapist or counselor if they know of a local pastor or other Christian minister who is familiar with OCD because you have some questions for that person. If the therapist or counselor doesn't know of anyone, then perhaps you can come back to this forum and someone here and research it for you.
Dealing with OCD is something you need help working through. As you do so with some trained professionals, seek out that minister or pastor who knows about what you are going through with it. In the meantime, try not to worry about this blasphemy issue until you are better able to get a handle on this mental disorder you suffer from. It is a confusing topic for many of us who don't have the struggles making decisions that you do with OCD.
Pray, continue to study the scriptures, and seek some help from those who are nearby who can help you.
I also with remember you in my prayers..